Benchmark: Array concat vs spread operator vs push #2

Tests:

Array.prototype.concat
var params = [ "hello"]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello"] var other = [ 1, 2, params[0] ]
Push
var params = [ "hello"]; var other = [ 1, 2 ].push(params[0]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser/OS: Chrome 84 on Mac OS X 10.15.6

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	6087226.0 Ops/sec
spread operator	840647040.0 Ops/sec
Push	38024360.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

The provided JSON represents a benchmark test case on MeasureThat.net, which compares the performance of three approaches: using the `concat()` method, the spread operator (`...`), and the `push()` method to concatenate arrays. We'll break down each approach, their pros and cons, and discuss other alternatives.

**1. Array.prototype.concat()**

The first approach uses the traditional `concat()` method to concatenate two arrays. This method creates a new array by copying elements from both arrays and returns the new array.

Pros:

* Wide support across browsers and JavaScript versions
* Well-documented and widely used

Cons:

* Creates a new array, which can lead to increased memory usage for large datasets
* Can be slower due to the creation of a new array object

**2. Spread Operator (`...`)**

The second approach uses the spread operator to concatenate two arrays. This operator was introduced in ECMAScript 2015 (ES6) and allows you to expand an array into a new array.

Pros:

* More concise and readable than traditional `concat()`
* Creates a new array without copying elements, reducing memory usage
* Fast execution due to its native implementation

Cons:

* May not be supported in older JavaScript versions or browsers that don't implement ES6 features
* Can be slower if the spread operator is used incorrectly (e.g., with arrays of primitive values)

**3. Array.prototype.push()**

The third approach uses the `push()` method to concatenate two arrays. This method adds one or more elements to the end of an array and returns the updated array.

Pros:

* More concise than traditional `concat()` or using the spread operator
* Does not create a new array, reducing memory usage

Cons:

* Can be slower due to the need to update the existing array's length property
* May not be supported in older JavaScript versions or browsers that don't implement ES6 features

**Library: Lodash**

In the provided benchmark test case, none of the approaches use any external libraries. However, if a library like Lodash were used, it might provide additional functionality for working with arrays and objects.

**Special JS Feature/Syntax: None**

There are no special JavaScript features or syntax being tested in this benchmark. The focus is solely on comparing the performance of three different array concatenation approaches.

**Alternatives**

Other alternatives to these approaches include:

* Using `Array.prototype spread` (introduced in ECMAScript 2019) which allows you to concatenate arrays using the `...` operator
* Using libraries like Immutable.js or Ramda, which provide alternative data structures and operations for working with arrays and objects.
* Implementing custom array concatenation functions using techniques like iteratively copying elements from one array to another.

Keep in mind that the choice of approach often depends on the specific use case, personal preference, and performance requirements.

Related benchmarks:

Array concat vs spread operator vs push #2 (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: Array.prototype.concat vs spread operator vs Push

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):